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Full Discussion: converting epoch time
Top Forums Shell Programming and Scripting converting epoch time Post 302528886 by Skrynesaver on Wednesday 8th of June 2011 06:59:11 AM
Old 06-08-2011
Quote:
Originally Posted by hernand
SORRY guys, I was informed now that 30416938966 is not epoch time, it defines microseconds elapsed since midnight of the day, the file was created(this file has to be created on daily basis).
So what I really need is to replace "30416938966 "in the file with "Current date" in this format "20110607", plus the time which we can parse from the value 30416938966 in this format "08:06:30"
So you need to divide by 1000 and add that to the creation time of the file in epoch. Something like the following:
Code:
perl -e 'open INPUT ,"<", "referenceFile";
@stat=stat(INPUT);
$asEpoch=$stat[10] +  (30416938966 / 1000); 
print int($asEpoch),"\n";'

 

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GETDATE(1)							   User Commands							GETDATE(1)

NAME
getdate - AME SYNOPSIS
[-dv][-n dec][-f format] [ra dec sys] itype2otype [date and/or time] DESCRIPTION
Convert date and time between various formats [-dv][-n dec][-f format] itype2otype @file itype: nfd=ISOFITS fd=FITS, dt=yyyy.mmdd, hr=hh:mm:ss, deg=dd:mm:ss jd=Julian Date, mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD ep=epoch, epj=Julian epoch, epb=Besselian epoch lt=local time, ut=UT, ts=seconds since 1950-01-01 now=current time, ang=fractional degrees otype: fd=FITS, dt=yyyy.mmdd, jd=Julian Date, mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD hr=hh:mm:ss, deg=dd:mm:ss, ang=fractional degrees ep=epoch, epj=Julian epoch, epb=Besselian epoch ts=seconds since 1950-01-01, tsu=Unix sec, tsi=IRAF sec gst=Greenwich Sidereal Time, lst=Local Sidereal Time @file: First one or two columns are in itype format ra dec sys: Need for Heliocentric conversions -a: Append date to input file, if there is one -d: Print date without time -e: Print output as ET/TDT/TT converting from UT -f: Format for output number (C printf) -h hours: Longitude in hours, west positive -l degrees: Longitude in degrees, west positive -n: Number of decimal places in sec, epoch, JD -t: Print time without date -v: Verbose getdate 3.8.4 June 2012 GETDATE(1)
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